    canvas {
        display: block;
    }
    *{
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }
    body{
       
        display: flex;
        justify-content: center;
        align-items: center; 
        height: 100%;
        width: 100%;
    }

    .mark{
        font-family: 'fangsong';
        position: absolute;
        height: 50px;
        width: 150px;
        bottom: 50px;
        
        text-align: center;
        color: rgb(0, 0, 0);
        line-height: 50px;
        font-size: 25px;
        user-select: none;
    }
    .again{
        font-family: 'fangsong';
        position: absolute;
        height: 30px;
        width: 100px;
        bottom: 10px;
        line-height: 30px;
        text-align: center;
        box-shadow: inset 0 0 10px white;
        color: rgb(0, 0, 0);
        cursor: pointer;
        border-radius: 5px;
        user-select: none;
    }
    .again:hover{
        background-color: rgb(21, 168, 29);
    }
    h1{
        position: fixed;
        top: 10%;
        left: 50%;
        transform: translate(-50%,-50%);
        font-size: 80px;
        font-family: 'fangsong';
        color: rgb(1, 175, 255);
    }
    .kuang {
        position: absolute;
        text-align: center;
        bottom: 0;
        top:90%;
        font-size: 16px;
        color: #FFFFFF;
        margin: 25px 0;
        width: 300px;
        height: 45px;
        line-height: 45px;
        background: #E0E0E0;
        border-radius: 5px;
        background-color: #1B68FD;
        left: 40%;
        transform: translateX(-50%);
    }
    .btn{
        text-align: center;
        font-size: 20px;
        color: black;
        width: 50px;
        height: 45px;
        background-color:cornsilk;
    }
    .sm{
        font-size: 20px;
    }
    .btn:hover{
        background-color: rgb(21, 168, 29);
    }
    .sy{
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%,-50%);
        font-size: 80px;
        font-family: 'fangsong';
        color: rgb(1, 175, 255);
    }
    /* 对按钮控制框在pc中进行隐藏*/ 
    @media (min-width: 769px){.btn{display:none;}}
    @media (min-width: 769px){.kuang{display:none;}}
    